Yoga $20.00 Inside Message Blank Inside Packages of Heartstrings® cards are shrink-wrapped and sold in sets of 10 cards with envelopes. The actual card size is 4 1/4" x 5 1/2". Yoga quantity Add to cart SKU: 909. Category: Sports. Related Products Read Between the Pines $20.00 A sight for sore thighs $20.00 Father, sun and holy bicycle $20.00 No Guts, No Story $20.00